#!/usr/bin/env bash
  
script_name="$(basename $(realpath $0))"
working_dir="$(dirname $(realpath $0))"

conf_file="${working_dir}/conf/${script_name%%.*}.conf"

LOCK_DIR="/tmp/$(basename $0).$$.LOCK"
log_file="${LOCK_DIR}/${script_name%%.*}.log"

DIST="ubuntu"
DIST_RELEASE="xenial"


# ----------
# Base Function(s)
# ----------

clean_up() {

   # Perform program exit housekeeping
   rm -rf "$LOCK_DIR"
   blank_line
   exit $1
}

echononl(){
   if $terminal ; then
      echo X\\c > /tmp/shprompt$$
      if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
         echo -e -n "   $*\\c" 1>&2
      else
         echo -e -n "   $*" 1>&2
      fi
      rm /tmp/shprompt$$
   fi
}
fatal(){
   echo ""
   if $terminal ; then
      echo -e "   [ \033[31m\033[1mFatal\033[m ] $*"
   else
      echo -e "   [ Fatal ] $*"
   fi
   echo ""
   if $terminal ; then
      echo -e "             \033[1mScript terminated\033[m.."
   else
      echo -e "             Script terminated.."
   fi
   echo ""
   rm -rf $LOCK_DIR
   exit 1
}
error (){
   echo ""
   if $terminal ; then
      echo -e "   [ \033[31m\033[1mError\033[m ] $*"
   else
      echo "   [ Error ] $*"
   fi
   echo ""
}

echo_ok() {
   if $terminal ; then
      echo -e "\033[85G[ \033[32mok\033[m ]"
   fi
}
echo_failed(){
   if $terminal ; then
      echo -e "\033[85G[ \033[1;31mfailed\033[m ]"
   fi
}
echo_skipped() {
   if $terminal ; then
      echo -e "\033[85G[ \033[33m\033[1mskipped\033[m ]"
   fi
}
echo_wait(){
   if $terminal ; then
      echo -en "\033[85G[ \033[5m\033[1m..\033[m ]"
   fi
}

trim() {
    local var="$*"
    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
    echo -n "$var"
}

blank_line() {
   if $terminal ; then
      echo ""
   fi
}



# ----------
# - Jobhandling
# ----------

# - Run 'clean_up' for signals SIGHUP SIGINT SIGTERM
# -
trap clean_up SIGHUP SIGINT SIGTERM

# - Create lock directory '$LOCK_DIR"
#
mkdir "$LOCK_DIR"


# ----------
# - Some checks ..
# ----------

# - Running in a terminal?
# -
if [[ -t 1 ]] ; then
   terminal=true
else
   fatal "Script must run in a terminal."
fi


# ==========
# - Begin Main Script
# ==========

# ----------
# - Headline
# ----------

if $terminal ; then
   echo ""
   echo -e "\033[1m----------\033[m"
   echo -e "\033[32m\033[1mRunning script \033[m\033[1m$script_name\033[32m .. \033[m"
   echo -e "\033[1m----------\033[m"
fi

FQDN_HOSTNAME=
echo ""
echo -e "\033[32m--\033[m"
echo ""
echo "Insert full qualified hostname for BigBlueButton Service"
echo ""
if [[ -n "$_FQDN_HOSTNAME" ]]; then
   echononl "Full qualified hostname [${_FQDN_HOSTNAME}]: "
   read FQDN_HOSTNAME
   if [[ "X${FQDN_HOSTNAME}" = "X" ]]; then
      FQDN_HOSTNAME=$_FQDN_HOSTNAME
   fi
else
   while [[ "X${FQDN_HOSTNAME}" = "X" ]]; do
      echononl "Full qualified hostname: "
      read FQDN_HOSTNAME
      if [[ "X${FQDN_HOSTNAME}" = "X" ]]; then
         echo -e "\n\t\033[33m\033[1mFull qualified hostname is reqired\033[m\n"
      fi
   done
fi

HOSTNAME="${FQDN_HOSTNAME%%.*}"

echo ""
echo ""
echo -e "\t\033[32mStart pre-install script for BigBlueButton Service with the following parameters\033[m"
echo ""
echo -e "\tFull qualified Hostname..: $FQDN_HOSTNAME"
echo -e "\tHostname.................: $HOSTNAME"
echo ""
echononl "einverstanden (yes/no): "
read OK
OK=${OK,,}
while [ "X$OK" != "Xyes" -a "X$OK" != "Xno" ]; do
   echononl "Wrong entry! [yes/no]: "
   read OK
   OK=${OK,,}
done
[ $OK = "yes" ] || fatal Repeat with other settings..

echo ""
echo ""




# /etc/resolf.conf
#
#echononl "Remove symlink '/etc/resolv.conf'.."
#if [[ -h "/etc/resolv.conf" ]]; then
#	rm /etc/resolv.conf > $log_file 2>&1
#	if [[ $? -ne 0 ]]; then
#   	echo_failed
#   	error "$(cat "$log_file")"
#	else
#   	echo_ok
#	fi
#else
#	echo_skipped
#fi
#
#echononl "Create new file '/etc/resolv.conf'.."
#cat <<EOF > /etc/resolv.conf 2> $log_file
#### Hetzner Online GmbH installimage
## nameserver config
#nameserver 213.133.100.100
#nameserver 213.133.98.98
#nameserver 213.133.99.99
#nameserver 2a01:4f8:0:1::add:9898
#nameserver 2a01:4f8:0:1::add:1010
#nameserver 2a01:4f8:0:1::add:9999
#EOF
#if [[ $? -ne 0 ]]; then
#	echo_failed
#	error "$(cat "$log_file")"
#else
#	echo_ok
#fi


echononl "Set FQDN hostname (IPv4).."
perl -i -n -p -e "s/^127\.0\.1\.1.*/127.0.1.1 $FQDN_HOSTNAME $HOSTNAME/" /etc/hosts > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

blank_line

echononl "Create sources.list for '$DIST $DIST_RELEASE'.."
cat <<EOF > /etc/apt/sources.list 2> "$log_file"
deb http://archive.ubuntu.com/ubuntu ${DIST_RELEASE} main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu ${DIST_RELEASE}-updates main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu ${DIST_RELEASE}-security main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu ${DIST_RELEASE}-backports main restricted universe multiverse
EOF
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

echononl "Update repositories.."
apt-get update > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

echononl "Upgrade System.."
apt-get --yes dist-upgrade > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

blank_line


# Set the locale of the server to 'en_US.UTF-8'.
 
echononl "Install 'language-pack-en'.."
apt-get install --yes language-pack-en > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

echononl "Set the locale of the server to 'en_US.UTF-8'.."
update-locale LANG=en_US.UTF-8 > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

echononl "Set system environment to 'en_US.UTF-8'.."
systemctl set-environment LANG=en_US.UTF-8 > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

blank_line


# BigBlueButton’s components, such as Tomcat, need a source of entropy when starting up. 
#
echononl "Install 'haveged'.."
apt-get install --yes haveged > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

echononl "Install 'software-properties-common'.."
apt-get install --yes software-properties-common -y > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

blank_line


# Add reposototies for 'ffmpeg' (create recordings) and 'yq' (update YAML files)
#
# Note:
#     The default version of ffmpeg in Ubuntu 16.04 is old and yq does not exist 
#     in the default repositories
#
echononl "Add repository for 'ffmpeg' .."
add-apt-repository ppa:bigbluebutton/support -y > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
   echo_failed
   error "$(cat "$log_file")"
else
   echo_ok
fi

echononl "Add repository for 'yq'.."
add-apt-repository ppa:rmescandon/yq -y > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
   echo_failed
   error "$(cat "$log_file")"
else
   echo_ok
fi

echononl "Update repositories.."
apt-get update > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

echononl "Upgrade System.."
apt-get --yes dist-upgrade > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

blank_line

# add repository for mongodb
#
echononl "Add apt key for 'mongodb' repository.."
wget -qO - https://www.mongodb.org/static/pgp/server-3.4.asc | sudo apt-key add - > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

echononl "Add repository for 'mongodb'.."
cat <<EOF > /etc/apt/sources.list.d/mongodb-org-3.4.list 2> "$log_file"
deb [ arch=amd64,arm64 ] http://repo.mongodb.org/apt/ubuntu ${DIST_RELEASE}/mongodb-org/3.4 multiverse
EOF
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

echononl "Update repositories.."
apt-get update > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

echononl "Install mongo-db and curl .."
apt-get install -y mongodb-org curl > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

blank_line


# install nodejs
#
echononl "Trigger script to install the NodeSource Node.js 8.x LTS Carbon repo.."
echo_wait
curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash - > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

echononl "Install nodejs.."
apt-get install -y nodejs > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi


# apt-get key for BigBlueButton repository
#
echononl "Add apt key for BigBlueButton repository.."
wget https://ubuntu.bigbluebutton.org/repo/bigbluebutton.asc -O- 2> "$log_file" | sudo apt-key add - > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

# add the repository for BigBlueButton 2.2 packages
#
echononl "Add repository for BigBlueButton 2.2 packages.."
cat <<EOF > /etc/apt/sources.list.d/bigbluebutton.list 2> "$log_file"
deb https://ubuntu.bigbluebutton.org/${DIST_RELEASE}-220/ bigbluebutton-${DIST_RELEASE} main
EOF
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi


echononl "Update repositories.."
apt-get update > "$log_file" 2>&1
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

blank_line


# Create 'override'-directory for service 'redis-server'
#
echononl "Create 'override'-directory for service 'redis-server'.."
if [[ -d "/etc/systemd/system/redis-server.service.d" ]] ; then
	echo_skipped
else
	mkdir /etc/systemd/system/redis-server.service.d
	if [[ $? -ne 0 ]]; then
		echo_failed
		error "$(cat "$log_file")"
	else
		echo_ok
	fi
fi

echononl "Create 'override'-file for service 'redis-server'.."
cat <<EOF > /etc/systemd/system/redis-server.service.d/override.conf 2> "$log_file"
[Service]
PrivateDevices=no
EOF
if [[ $? -ne 0 ]]; then
	echo_failed
	error "$(cat "$log_file")"
else
	echo_ok
fi

clean_up 0